const data1 = [{
    title: '江西',
    id: 1,
    children: [{
        title: '南昌',
        id: 2,
        children: [{
            title: '高新区', //三级菜单
            id: 3,
            children: [{
                title: '12121', //三级菜单
                id: 9
            }]
            //…… //以此类推，可无限层级
        }]
    }]
}, {
    title: '陕西', //一级菜单
    id: 4,
    children: [{
        title: '西安', //二级菜单
        id: 5
    }]
}]
const data2 = [{
    title: '江西',
    id: 1,
    children: [{
        title: '南昌',
        id: 2,
        children: [{
            title: '高新区', //三级菜单
            id: 3,
            children: [{
                title: '12121', //三级菜单
                id: 9
            }]
        }]
    }]
}, {
    title: '陕西', //一级菜单
    id: 4,
    children: [{
        title: '西安', //二级菜单
        id: 5
    }]
}]